Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a3fd53a980de98…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 01:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 810ed3a3ab5145cd51db82ec44246266 SHA-1: 082edaa7cd542961f07967db0abaa8bc9f2930a2 SHA-256: 80a3fd53a980de98ef96d63cc4eda5ab89f175fae02029b2fcf986788698d309
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide clickable elements. It contains numerous links pointing to potentially compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vecsecity.info/editor_up/71632620141.pdf In PDF document text
    • http://dellalontra.it/userfiles/files/xodiwoxa.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/wubibuxataleved.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedd8e1df2---23221261034.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/72695479048.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/2875777228.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/83460137912.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/vomobijokivuvavexe.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/xiboxedi.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/bumixavosiz.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/66733091737.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/23270948775.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/lipefofunofe.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/96652863463.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/27fd548b3744595758e61082ad6c9136/gitakaj.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/35300815959.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd5534a52---pizasudiruxovupomop.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/kipopesilerorawuter.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/metari.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613172c473a05---gaviwejujebifi.pdfIn PDF document text
    • http://ttc-investco.com/img/files/figikibaraxudogijaw.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/tavuxebowajazawomi.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061028257055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+abolition+of+man+cs+lewis+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF22 14184 bytes
SHA-256: e169b76327bfe16706468332e9cbcd9c55b8cbd05d1a514ca52614d0fb8acc9c
font_01_sfnt_off0000d23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 10972 bytes
SHA-256: 293301b7e97d04cad7cdb6ae92601769cbbded85c27612b881401637a8b6914e

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